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View All Date & Time ToolsRegex Tester
Test regular expressions against sample text, inspect matches, and review capture groups in one workspace.
Editor
Regex Pattern & Test Text
Enter a regex pattern, choose flags, then test it against sample or custom text without leaving the workspace.
Flags
Output
Match Results
Review match positions, full matches, capture groups, and named groups in a read-only inspection view.
Read-only match output
Matched Text
Ready
Status
The status panel keeps live valid, invalid, and no-match feedback separate from the result list.
Workspace Summary
Use this summary to confirm pattern size, text size, total matches, and the currently active flags.
How to use the regex tester
- Enter a regular expression pattern in the pattern field at the top of the workspace.
- Toggle the regex flags you need, such as global, case-insensitive, multiline, dot-all, unicode, or sticky.
- Paste or type the test text into the editor pane on the left side.
- Use Test to compile the regex and inspect matches, capture groups, and named groups in the output pane.
- Use Sample when you want a working example loaded into the workspace before trying your own pattern.
Regex tester examples
- Check whether a pattern correctly extracts IDs, slugs, or tokens from a block of log text.
- Inspect capture groups before reusing a regex in JavaScript, a validation rule, or a search-and-replace workflow.
- Toggle flags such as global or case-insensitive matching to confirm how the same pattern behaves under different conditions.
What this regex tester does
This regex tester gives you a workspace for trying regular expressions against real text before you move them into code, validation rules, or configuration. Instead of only confirming whether a regex compiles, it also shows where matches appear and what the capture groups contain.
That makes it useful for debugging search patterns, preparing extraction logic, checking named groups, and verifying whether flags such as global or multiline behave the way you expect.
Why flags and match inspection matter
A regex pattern rarely lives alone. Flags such as global, case-insensitive, multiline, dot-all, unicode, and sticky can change how the same expression behaves. A tester is most useful when it lets you see those differences quickly and verify the exact matches you will get.
This workspace keeps the flags, text input, result list, and status feedback together so you can adjust one piece at a time without losing context.
Regex tester FAQs
Does this regex tester show capture groups?
Yes. When the regex matches, the output pane shows the full match plus capture groups and named groups when they exist.
What happens if the regex pattern is invalid?
The status panel shows an invalid state and the output pane avoids showing misleading match data until the pattern is fixed.
Can I test regex flags like global or case-insensitive?
Yes. The workspace includes flag toggles so you can test the same pattern with different regex behaviors.